8 CSS Navbar Designs08 / 08

CSS + JSMIT licensed

CSS Navbar with Underline Hover Animation

A minimalist CSS navbar with three distinct underline hover animation techniques side-by-side — proving that the most elegant nav effects come from doing less, not more. Variant 1 (the production nav at top) uses a JS-driven magnetic ink line: a single absolutely-positioned 1.5px rail glides between hovered items via getBoundingClientRect, with a red static line marking the active item. Variant 2 is pure CSS — each link owns an `::after` pseudo-element that starts at `left: 50%; right: 50%` (zero width, centered) and expands outward to the padding edge on hover, blooming symmetrically. Variant 3 uses the same `::after` trick but transitions only one edge, producing a left-anchored directional wipe. The page includes a Libre Baskerville serif "art of the quiet hover" hero, an A–Z alphabet ticker where every letter gets the underline treatment, and a 4-row showcase list where each title gets a 2px red underline wipe on hover. Libre Baskerville + Instrument Sans. Best for editorial sites, personal portfolios, design studio navs, content-led blogs, minimalist typography-first layouts.

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Live Demo
Try it

This is a full-page demo — interact inside the frame above, or open it in the playground for the full-screen experience.

The code

<section class="nb-und" aria-label="CSS navbar with underline hover animation demo">
  <nav aria-label="Primary">
    <div class="nav-inner">
      <a href="#" class="brand">Thesis</a>

      <div class="nav-links-wrap" data-nb-und-wrap>
        <div class="ink-line" data-nb-und-line aria-hidden="true"></div>
        <div class="ink-line-static" data-nb-und-static aria-hidden="true"></div>

        <ul class="nav-links" data-nb-und-nav>
          <li><a href="#" class="active"><span>Studio</span></a></li>
          <li><a href="#"><span>Work</span></a></li>
          <li><a href="#"><span>Writing</span></a></li>
          <li><a href="#"><span>Process</span></a></li>
          <li><a href="#"><span>Archive</span></a></li>
          <li><a href="#"><span>Contact</span></a></li>
        </ul>
      </div>

      <div class="nav-spacer"></div>

      <div class="nav-end">
        <a href="#">Index</a>
        <div class="nav-end-dot" aria-hidden="true"></div>
        <a href="#">RSS</a>
        <div class="nav-end-dot" aria-hidden="true"></div>
        <button class="btn-nav" type="button">Inquire</button>
      </div>
    </div>
  </nav>

  <div class="page">
    <div class="hero">
      <div class="hero-left">
        <h1>The art of<br>the <em>quiet</em><br>hover.</h1>
        <p>Three distinct CSS underline animation techniques — each achieving elegance through restraint. The navbar above uses a magnetic sliding ink line that follows your cursor. Below, explore every method.</p>
      </div>
      <div class="hero-right">
        <p>"Typography is a <strong>silent conversation</strong> — the best underlines join it without interrupting. Hover the navigation above and each demo below to see them in motion."</p>
      </div>
    </div>

    <div class="section-rule"></div>

    <section class="section">
      <div class="variant-label">
        <span class="variant-num">01</span>
        <div class="variant-info">
          <h3>Magnetic Sliding Line — Single Global Rail</h3>
          <p>One line glides beneath the entire nav, tracking the hovered link. Active item uses a static accent-colored line.</p>
        </div>
      </div>
      <div class="demo-nav">
        <div class="nav-links-wrap demo-wrap" data-nb-und-demo-wrap>
          <div class="ink-line" data-nb-und-demo-line aria-hidden="true"></div>
          <div class="ink-line-static" data-nb-und-demo-static aria-hidden="true"></div>
          <ul class="nav-links" data-nb-und-demo-nav>
            <li><a href="#" class="active"><span>Objects</span></a></li>
            <li><a href="#"><span>Spaces</span></a></li>
            <li><a href="#"><span>Systems</span></a></li>
            <li><a href="#"><span>Texts</span></a></li>
            <li><a href="#"><span>People</span></a></li>
          </ul>
        </div>
      </div>
      <p class="code-note">
        One <code>.ink-line</code> element is positioned with JS using <code>getBoundingClientRect()</code> on each hover target.
        CSS <code>transition: left, width</code> with <code>cubic-bezier(0.25,1,0.5,1)</code> creates the magnetic feel.
        The static <code>.ink-line-static</code> marks the active item in accent red.
      </p>
    </section>

    <div class="section-rule"></div>

    <section class="section">
      <div class="variant-label">
        <span class="variant-num">02</span>
        <div class="variant-info">
          <h3>Center-Bloom — Per-Link <code>::after</code> Pseudo-Element</h3>
          <p>Each link owns its underline. On hover, it expands from the center outward — no JavaScript needed at all.</p>
        </div>
      </div>
      <div class="demo-nav">
        <ul class="nav-links-v2">
          <li><a href="#" class="active">Foundations</a></li>
          <li><a href="#">Components</a></li>
          <li><a href="#">Patterns</a></li>
          <li><a href="#">Motion</a></li>
          <li><a href="#">Tokens</a></li>
        </ul>
      </div>
      <p class="code-note">
        CSS only. Each <code>a::after</code> starts at <code>left: 50%; right: 50%</code> (zero width, centered).
        On <code>:hover</code>, <code>left</code> and <code>right</code> both animate to the padding value — blooming outward symmetrically.
      </p>
    </section>

    <div class="section-rule"></div>

    <section class="section">
      <div class="variant-label">
        <span class="variant-num">03</span>
        <div class="variant-info">
          <h3>Left-Wipe — Directional Reveal</h3>
          <p>The underline sweeps in from the left, anchored to the link's left edge. Clean, directional, editorial.</p>
        </div>
      </div>
      <div class="demo-nav">
        <ul class="nav-links-v3">
          <li><a href="#" class="active">Editorial</a></li>
          <li><a href="#">Research</a></li>
          <li><a href="#">Narrative</a></li>
          <li><a href="#">Margins</a></li>
          <li><a href="#">Colophon</a></li>
        </ul>
      </div>
      <p class="code-note">
        CSS only. <code>a::before</code> starts at <code>left: 50%; right: 50%</code> and transitions to <code>left: 1.1rem; right: 1.1rem</code>.
        The asymmetric easing of <code>left</code> gives it the wipe directionality.
      </p>
    </section>

    <div class="section-rule"></div>

    <div class="alphabet-demo">
      <p class="alpha-label">Every link, same principle — hover any letter</p>
      <div class="alpha-links" data-nb-und-alpha></div>
    </div>

    <div class="section-rule"></div>

    <div class="showcase">
      <div class="showcase-item">
        <span class="showcase-title">Clarity</span>
        <div class="showcase-right">
          <span class="showcase-meta">Principle 01</span>
          <span class="showcase-arrow" aria-hidden="true">→</span>
        </div>
      </div>
      <div class="showcase-item">
        <span class="showcase-title">Restraint</span>
        <div class="showcase-right">
          <span class="showcase-meta">Principle 02</span>
          <span class="showcase-arrow" aria-hidden="true">→</span>
        </div>
      </div>
      <div class="showcase-item">
        <span class="showcase-title">Intention</span>
        <div class="showcase-right">
          <span class="showcase-meta">Principle 03</span>
          <span class="showcase-arrow" aria-hidden="true">→</span>
        </div>
      </div>
      <div class="showcase-item">
        <span class="showcase-title">Motion</span>
        <div class="showcase-right">
          <span class="showcase-meta">Principle 04</span>
          <span class="showcase-arrow" aria-hidden="true">→</span>
        </div>
      </div>
    </div>
  </div>
</section>
/* ─── 08 Thesis — CSS navbar underline hover animation UI ─────── */

@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=Instrument+Sans:ital,wght@0,400;0,500;0,600;1,400&display=swap');

.nb-und {
  --nb-und-paper: #f8f6f1;
  --nb-und-ink: #1a1916;
  --nb-und-ink-2: #6b6760;
  --nb-und-ink-3: #b5b2ac;
  --nb-und-rule: #e0ddd6;
  --nb-und-red: #c93a24;
  --nb-und-nav-h: 70px;
  position: relative;
  width: 100%;
  min-height: 1600px;
  background: var(--nb-und-paper);
  color: var(--nb-und-ink);
  font-family: 'Instrument Sans', sans-serif;
  overflow: clip;
  box-sizing: border-box;
}

.nb-und *,
.nb-und *::before,
.nb-und *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.nb-und nav {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nb-und-nav-h);
  background: var(--nb-und-paper);
  border-bottom: 1px solid var(--nb-und-rule);
}

.nb-und .nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 3rem;
}

.nb-und .brand {
  font-family: 'Libre Baskerville', serif;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--nb-und-ink);
  text-decoration: none;
  flex-shrink: 0;
  margin-right: 4rem;
}

.nb-und .nav-links-wrap {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.nb-und .nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}

.nb-und .ink-line {
  position: absolute;
  bottom: -1px;
  height: 1.5px;
  background: var(--nb-und-ink);
  transition: left 0.38s cubic-bezier(0.25, 1, 0.5, 1), width 0.38s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.25s;
  pointer-events: none;
  opacity: 0;
}

.nb-und .ink-line.visible {
  opacity: 1;
}

.nb-und .ink-line-static {
  position: absolute;
  bottom: -1px;
  height: 1.5px;
  background: var(--nb-und-red);
  pointer-events: none;
  transition: left 0.4s cubic-bezier(0.25, 1, 0.5, 1), width 0.4s;
}

.nb-und .nav-links a {
  display: flex;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--nb-und-ink-2);
  text-decoration: none;
  padding: 0 1.1rem;
  height: var(--nb-und-nav-h);
  transition: color 0.22s;
  position: relative;
  white-space: nowrap;
}

.nb-und .nav-links a:hover {
  color: var(--nb-und-ink);
}

.nb-und .nav-links a.active {
  color: var(--nb-und-ink);
}

.nb-und .nav-links a span {
  display: inline-block;
  transition: letter-spacing 0.35s cubic-bezier(0.25, 1, 0.5, 1);
}

.nb-und .nav-links a:hover span {
  letter-spacing: 0.09em;
}

.nb-und .nav-links a.active span {
  letter-spacing: 0.02em;
}
/* Variant 2 — center-bloom (pure CSS) */

.nb-und .nav-links-v2 {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}

.nb-und .nav-links-v2 a {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--nb-und-ink-2);
  text-decoration: none;
  padding: 0 1.1rem;
  height: var(--nb-und-nav-h);
  position: relative;
  white-space: nowrap;
  transition: color 0.22s;
}

.nb-und .nav-links-v2 a:hover {
  color: var(--nb-und-ink);
}

.nb-und .nav-links-v2 a.active {
  color: var(--nb-und-ink);
}

.nb-und .nav-links-v2 a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  right: 50%;
  height: 1.5px;
  background: var(--nb-und-ink);
  transition: left 0.35s cubic-bezier(0.25, 1, 0.5, 1), right 0.35s cubic-bezier(0.25, 1, 0.5, 1);
}

.nb-und .nav-links-v2 a.active::after {
  background: var(--nb-und-red);
  left: 1.1rem;
  right: 1.1rem;
}

.nb-und .nav-links-v2 a:hover::after {
  left: 1.1rem;
  right: 1.1rem;
}
/* Variant 3 — left-wipe */

.nb-und .nav-links-v3 {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}

.nb-und .nav-links-v3 a {
  display: flex;
  align-items: center;
  height: var(--nb-und-nav-h);
  padding: 0 1.1rem;
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--nb-und-ink-2);
  transition: color 0.22s;
}

.nb-und .nav-links-v3 a:hover,
.nb-und .nav-links-v3 a.active {
  color: var(--nb-und-ink);
}

.nb-und .nav-links-v3 a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  right: 50%;
  height: 1.5px;
  background: var(--nb-und-ink);
  transition: left 0.3s ease, right 0.3s ease;
}

.nb-und .nav-links-v3 a:hover::before {
  left: 1.1rem;
  right: 1.1rem;
}

.nb-und .nav-links-v3 a.active::before {
  left: 1.1rem;
  right: 1.1rem;
  background: var(--nb-und-red);
}

.nb-und .nav-spacer {
  flex: 1;
}

.nb-und .nav-end {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-shrink: 0;
}

.nb-und .nav-end a {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--nb-und-ink-2);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}

.nb-und .nav-end a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  right: 50%;
  height: 1px;
  background: var(--nb-und-ink);
  transition: left 0.3s ease, right 0.3s ease;
}

.nb-und .nav-end a:hover {
  color: var(--nb-und-ink);
}

.nb-und .nav-end a:hover::after {
  left: 0;
  right: 0;
}

.nb-und .nav-end-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--nb-und-rule);
}

.nb-und .btn-nav {
  font-family: 'Instrument Sans', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--nb-und-paper);
  background: var(--nb-und-ink);
  border: none;
  padding: 8px 18px;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.2s;
}

.nb-und .btn-nav:hover {
  background: var(--nb-und-red);
}

.nb-und .page {
  padding-top: var(--nb-und-nav-h);
}

.nb-und .hero {
  padding: 6rem 3rem 4rem;
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: end;
}

.nb-und .hero-left h1 {
  font-family: 'Libre Baskerville', serif;
  font-size: clamp(3rem, 5vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--nb-und-ink);
  margin-bottom: 1.5rem;
}

.nb-und .hero-left h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--nb-und-red);
}

.nb-und .hero-left p {
  font-size: 1rem;
  color: var(--nb-und-ink-2);
  line-height: 1.7;
  max-width: 44ch;
}

.nb-und .hero-right {
  padding-bottom: 1rem;
}

.nb-und .hero-right p {
  font-family: 'Libre Baskerville', serif;
  font-size: 1.3rem;
  font-style: italic;
  font-weight: 400;
  color: var(--nb-und-ink-2);
  line-height: 1.6;
  max-width: 36ch;
}

.nb-und .hero-right p strong {
  color: var(--nb-und-ink);
  font-style: normal;
  font-weight: 700;
}

.nb-und .section-rule {
  height: 1px;
  background: var(--nb-und-rule);
  margin: 0 3rem;
}

.nb-und .section {
  padding: 5rem 3rem;
  max-width: 1440px;
  margin: 0 auto;
}

.nb-und .variant-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.nb-und .variant-num {
  font-family: 'Libre Baskerville', serif;
  font-size: 3rem;
  font-weight: 400;
  color: var(--nb-und-rule);
  line-height: 1;
}

.nb-und .variant-info h3 {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--nb-und-ink);
  letter-spacing: 0.02em;
  margin-bottom: 3px;
}

.nb-und .variant-info p {
  font-size: 0.78rem;
  color: var(--nb-und-ink-2);
  line-height: 1.5;
}

.nb-und .demo-nav {
  border: 1px solid var(--nb-und-rule);
  border-radius: 4px;
  background: var(--nb-und-paper);
  height: 60px;
  display: flex;
  align-items: center;
  padding: 0 2rem;
  position: relative;
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.nb-und .demo-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.nb-und .code-note {
  font-family: 'Instrument Sans', monospace;
  font-size: 0.72rem;
  color: var(--nb-und-ink-3);
  line-height: 1.7;
  background: #f2f0ea;
  border-left: 2px solid var(--nb-und-rule);
  padding: 0.75rem 1rem;
  border-radius: 0 3px 3px 0;
  margin-bottom: 3rem;
}

.nb-und .code-note code {
  font-family: monospace;
  color: var(--nb-und-red);
  font-size: 0.7rem;
}

.nb-und .alphabet-demo {
  margin: 4rem 3rem;
  padding: 3rem;
  border: 1px solid var(--nb-und-rule);
  border-radius: 4px;
  text-align: center;
}

.nb-und .alpha-label {
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--nb-und-ink-3);
  margin-bottom: 2rem;
}

.nb-und .alpha-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.nb-und .alpha-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-family: 'Libre Baskerville', serif;
  font-size: 1rem;
  color: var(--nb-und-ink-3);
  text-decoration: none;
  position: relative;
  transition: color 0.2s;
  border-radius: 4px;
}

.nb-und .alpha-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  right: 50%;
  height: 1px;
  background: var(--nb-und-ink);
  transition: left 0.3s ease, right 0.3s ease;
}

.nb-und .alpha-links a:hover {
  color: var(--nb-und-ink);
}

.nb-und .alpha-links a:hover::after {
  left: 8px;
  right: 8px;
}

.nb-und .showcase {
  padding: 5rem 3rem;
  border-top: 1px solid var(--nb-und-rule);
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.nb-und .showcase-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem 0;
  border-bottom: 1px solid var(--nb-und-rule);
  cursor: pointer;
  overflow: hidden;
  position: relative;
}

.nb-und .showcase-title {
  font-family: 'Libre Baskerville', serif;
  font-size: clamp(2rem, 4vw, 4rem);
  font-weight: 400;
  color: var(--nb-und-ink);
  line-height: 1;
  position: relative;
  display: inline-block;
  transition: color 0.2s;
}

.nb-und .showcase-title::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 100%;
  height: 2px;
  background: var(--nb-und-red);
  transition: right 0.5s cubic-bezier(0.25, 1, 0.5, 1);
}

.nb-und .showcase-item:hover .showcase-title::after {
  right: 0;
}

.nb-und .showcase-item:hover .showcase-title {
  color: var(--nb-und-red);
}

.nb-und .showcase-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nb-und .showcase-meta {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--nb-und-ink-3);
}

.nb-und .showcase-arrow {
  font-size: 1.5rem;
  color: var(--nb-und-ink-3);
  transform: translateX(-8px);
  transition: transform 0.3s ease, color 0.2s;
}

.nb-und .showcase-item:hover .showcase-arrow {
  transform: translateX(0);
  color: var(--nb-und-red);
}

@media (max-width: 900px) {
  .nb-und .hero {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3rem 1.5rem 2rem;
  }

  .nb-und .nav-end a,
    .nb-und .nav-end-dot {
    display: none;
  }

  .nb-und .section {
    padding: 3rem 1.5rem;
  }

  .nb-und .alphabet-demo {
    margin: 2rem 1.5rem;
    padding: 2rem 1rem;
  }

  .nb-und .showcase {
    padding: 3rem 1.5rem;
  }

  .nb-und .demo-nav {
    padding: 0 1rem;
  }

  .nb-und nav .nav-inner {
    padding: 0 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nb-und * {
    transition: none !important;
  }
}
(() => {
  // Scoped magnetic-line wiring. Two instances of the magnetic line
  // pattern run on the page (the main top nav + the demo nav in
  // variant 01). Each is independently bound to its wrapper + nav
  // + line + static-line via data-* attributes — no document.getElementById,
  // no shared state, multiple instances coexist safely.
  const root = document.querySelector('.nb-und');
  if (!root) return;

  function setupMagneticLine(navEl, wrapper, line, staticLine) {
    if (!navEl || !wrapper || !line || !staticLine) return;
    const links = navEl.querySelectorAll('a');

    function positionLine(el, targetLine, useAccent) {
      const wRect = wrapper.getBoundingClientRect();
      const rect = el.getBoundingClientRect();
      targetLine.style.left = (rect.left - wRect.left) + 'px';
      targetLine.style.width = rect.width + 'px';
      if (useAccent) targetLine.style.background = 'var(--nb-und-red)';
    }

    const active = navEl.querySelector('a.active');
    if (active) {
      requestAnimationFrame(() => positionLine(active, staticLine, true));
    }

    links.forEach((a) => {
      a.addEventListener('mouseenter', () => {
        positionLine(a, line);
        line.classList.add('visible');
      });
      a.addEventListener('click', (e) => {
        e.preventDefault();
        links.forEach((l) => l.classList.remove('active'));
        a.classList.add('active');
        positionLine(a, staticLine, true);
      });
    });
    wrapper.addEventListener('mouseleave', () => {
      line.classList.remove('visible');
    });
  }

  // Main top nav
  setupMagneticLine(
    root.querySelector('[data-nb-und-nav]'),
    root.querySelector('[data-nb-und-wrap]'),
    root.querySelector('[data-nb-und-line]'),
    root.querySelector('[data-nb-und-static]'),
  );

  // Demo 1 (the in-page variant showcase)
  setupMagneticLine(
    root.querySelector('[data-nb-und-demo-nav]'),
    root.querySelector('[data-nb-und-demo-wrap]'),
    root.querySelector('[data-nb-und-demo-line]'),
    root.querySelector('[data-nb-und-demo-static]'),
  );

  // Variant 2 / 3 click-to-activate (pure CSS hover; this just keeps the
  // active state in sync after a click).
  root.querySelectorAll('.nav-links-v2 a, .nav-links-v3 a').forEach((a) => {
    a.addEventListener('click', (e) => {
      e.preventDefault();
      const siblings = a.closest('ul').querySelectorAll('a');
      siblings.forEach((s) => s.classList.remove('active'));
      a.classList.add('active');
    });
  });

  // Alphabet ticker — 26 links built once.
  const alpha = root.querySelector('[data-nb-und-alpha]');
  if (alpha && alpha.childElementCount === 0) {
    'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('').forEach((ch) => {
      const a = document.createElement('a');
      a.href = '#';
      a.textContent = ch;
      a.addEventListener('click', (e) => e.preventDefault());
      alpha.appendChild(a);
    });
  }
})();
Paste this into ChatGPT, Claude, Cursor, or any coding assistant. The block below is pre-framed with everything the AI needs to integrate this demo into your project — markup, styles, scoping notes, and the source URL. Hit Copy and paste straight into your chat.
Here's a working CSS Navbar Design from CodeFronts. Use it as-is or adapt to your framework. All classes are scoped under a unique prefix so the code won't collide with your existing styles. MIT licensed.
Demo: CSS Navbar with Underline Hover Animation
Source: https://codefronts.com/navigation/css-navbars/css-navbar-with-underline-hover-animation/

A minimalist CSS navbar with three distinct underline hover animation techniques side-by-side — proving that the most elegant nav effects come from doing less, not more. Variant 1 (the production nav at top) uses a JS-driven magnetic ink line: a single absolutely-positioned 1.5px rail glides between hovered items via getBoundingClientRect, with a red static line marking the active item. Variant 2 is pure CSS — each link owns an `::after` pseudo-element that starts at `left: 50%; right: 50%` (zero width, centered) and expands outward to the padding edge on hover, blooming symmetrically. Variant 3 uses the same `::after` trick but transitions only one edge, producing a left-anchored directional wipe. The page includes a Libre Baskerville serif "art of the quiet hover" hero, an A–Z alphabet ticker where every letter gets the underline treatment, and a 4-row showcase list where each title gets a 2px red underline wipe on hover. Libre Baskerville + Instrument Sans. Best for editorial sites, personal portfolios, design studio navs, content-led blogs, minimalist typography-first layouts.
## HTML
```html
<section class="nb-und" aria-label="CSS navbar with underline hover animation demo">
  <nav aria-label="Primary">
    <div class="nav-inner">
      <a href="#" class="brand">Thesis</a>

      <div class="nav-links-wrap" data-nb-und-wrap>
        <div class="ink-line" data-nb-und-line aria-hidden="true"></div>
        <div class="ink-line-static" data-nb-und-static aria-hidden="true"></div>

        <ul class="nav-links" data-nb-und-nav>
          <li><a href="#" class="active"><span>Studio</span></a></li>
          <li><a href="#"><span>Work</span></a></li>
          <li><a href="#"><span>Writing</span></a></li>
          <li><a href="#"><span>Process</span></a></li>
          <li><a href="#"><span>Archive</span></a></li>
          <li><a href="#"><span>Contact</span></a></li>
        </ul>
      </div>

      <div class="nav-spacer"></div>

      <div class="nav-end">
        <a href="#">Index</a>
        <div class="nav-end-dot" aria-hidden="true"></div>
        <a href="#">RSS</a>
        <div class="nav-end-dot" aria-hidden="true"></div>
        <button class="btn-nav" type="button">Inquire</button>
      </div>
    </div>
  </nav>

  <div class="page">
    <div class="hero">
      <div class="hero-left">
        <h1>The art of<br>the <em>quiet</em><br>hover.</h1>
        <p>Three distinct CSS underline animation techniques — each achieving elegance through restraint. The navbar above uses a magnetic sliding ink line that follows your cursor. Below, explore every method.</p>
      </div>
      <div class="hero-right">
        <p>"Typography is a <strong>silent conversation</strong> — the best underlines join it without interrupting. Hover the navigation above and each demo below to see them in motion."</p>
      </div>
    </div>

    <div class="section-rule"></div>

    <section class="section">
      <div class="variant-label">
        <span class="variant-num">01</span>
        <div class="variant-info">
          <h3>Magnetic Sliding Line — Single Global Rail</h3>
          <p>One line glides beneath the entire nav, tracking the hovered link. Active item uses a static accent-colored line.</p>
        </div>
      </div>
      <div class="demo-nav">
        <div class="nav-links-wrap demo-wrap" data-nb-und-demo-wrap>
          <div class="ink-line" data-nb-und-demo-line aria-hidden="true"></div>
          <div class="ink-line-static" data-nb-und-demo-static aria-hidden="true"></div>
          <ul class="nav-links" data-nb-und-demo-nav>
            <li><a href="#" class="active"><span>Objects</span></a></li>
            <li><a href="#"><span>Spaces</span></a></li>
            <li><a href="#"><span>Systems</span></a></li>
            <li><a href="#"><span>Texts</span></a></li>
            <li><a href="#"><span>People</span></a></li>
          </ul>
        </div>
      </div>
      <p class="code-note">
        One <code>.ink-line</code> element is positioned with JS using <code>getBoundingClientRect()</code> on each hover target.
        CSS <code>transition: left, width</code> with <code>cubic-bezier(0.25,1,0.5,1)</code> creates the magnetic feel.
        The static <code>.ink-line-static</code> marks the active item in accent red.
      </p>
    </section>

    <div class="section-rule"></div>

    <section class="section">
      <div class="variant-label">
        <span class="variant-num">02</span>
        <div class="variant-info">
          <h3>Center-Bloom — Per-Link <code>::after</code> Pseudo-Element</h3>
          <p>Each link owns its underline. On hover, it expands from the center outward — no JavaScript needed at all.</p>
        </div>
      </div>
      <div class="demo-nav">
        <ul class="nav-links-v2">
          <li><a href="#" class="active">Foundations</a></li>
          <li><a href="#">Components</a></li>
          <li><a href="#">Patterns</a></li>
          <li><a href="#">Motion</a></li>
          <li><a href="#">Tokens</a></li>
        </ul>
      </div>
      <p class="code-note">
        CSS only. Each <code>a::after</code> starts at <code>left: 50%; right: 50%</code> (zero width, centered).
        On <code>:hover</code>, <code>left</code> and <code>right</code> both animate to the padding value — blooming outward symmetrically.
      </p>
    </section>

    <div class="section-rule"></div>

    <section class="section">
      <div class="variant-label">
        <span class="variant-num">03</span>
        <div class="variant-info">
          <h3>Left-Wipe — Directional Reveal</h3>
          <p>The underline sweeps in from the left, anchored to the link's left edge. Clean, directional, editorial.</p>
        </div>
      </div>
      <div class="demo-nav">
        <ul class="nav-links-v3">
          <li><a href="#" class="active">Editorial</a></li>
          <li><a href="#">Research</a></li>
          <li><a href="#">Narrative</a></li>
          <li><a href="#">Margins</a></li>
          <li><a href="#">Colophon</a></li>
        </ul>
      </div>
      <p class="code-note">
        CSS only. <code>a::before</code> starts at <code>left: 50%; right: 50%</code> and transitions to <code>left: 1.1rem; right: 1.1rem</code>.
        The asymmetric easing of <code>left</code> gives it the wipe directionality.
      </p>
    </section>

    <div class="section-rule"></div>

    <div class="alphabet-demo">
      <p class="alpha-label">Every link, same principle — hover any letter</p>
      <div class="alpha-links" data-nb-und-alpha></div>
    </div>

    <div class="section-rule"></div>

    <div class="showcase">
      <div class="showcase-item">
        <span class="showcase-title">Clarity</span>
        <div class="showcase-right">
          <span class="showcase-meta">Principle 01</span>
          <span class="showcase-arrow" aria-hidden="true">→</span>
        </div>
      </div>
      <div class="showcase-item">
        <span class="showcase-title">Restraint</span>
        <div class="showcase-right">
          <span class="showcase-meta">Principle 02</span>
          <span class="showcase-arrow" aria-hidden="true">→</span>
        </div>
      </div>
      <div class="showcase-item">
        <span class="showcase-title">Intention</span>
        <div class="showcase-right">
          <span class="showcase-meta">Principle 03</span>
          <span class="showcase-arrow" aria-hidden="true">→</span>
        </div>
      </div>
      <div class="showcase-item">
        <span class="showcase-title">Motion</span>
        <div class="showcase-right">
          <span class="showcase-meta">Principle 04</span>
          <span class="showcase-arrow" aria-hidden="true">→</span>
        </div>
      </div>
    </div>
  </div>
</section>
```
## CSS
```css
/* ─── 08 Thesis — CSS navbar underline hover animation UI ─────── */

@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=Instrument+Sans:ital,wght@0,400;0,500;0,600;1,400&display=swap');

.nb-und {
  --nb-und-paper: #f8f6f1;
  --nb-und-ink: #1a1916;
  --nb-und-ink-2: #6b6760;
  --nb-und-ink-3: #b5b2ac;
  --nb-und-rule: #e0ddd6;
  --nb-und-red: #c93a24;
  --nb-und-nav-h: 70px;
  position: relative;
  width: 100%;
  min-height: 1600px;
  background: var(--nb-und-paper);
  color: var(--nb-und-ink);
  font-family: 'Instrument Sans', sans-serif;
  overflow: clip;
  box-sizing: border-box;
}

.nb-und *,
.nb-und *::before,
.nb-und *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.nb-und nav {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nb-und-nav-h);
  background: var(--nb-und-paper);
  border-bottom: 1px solid var(--nb-und-rule);
}

.nb-und .nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 3rem;
}

.nb-und .brand {
  font-family: 'Libre Baskerville', serif;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--nb-und-ink);
  text-decoration: none;
  flex-shrink: 0;
  margin-right: 4rem;
}

.nb-und .nav-links-wrap {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.nb-und .nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}

.nb-und .ink-line {
  position: absolute;
  bottom: -1px;
  height: 1.5px;
  background: var(--nb-und-ink);
  transition: left 0.38s cubic-bezier(0.25, 1, 0.5, 1), width 0.38s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.25s;
  pointer-events: none;
  opacity: 0;
}

.nb-und .ink-line.visible {
  opacity: 1;
}

.nb-und .ink-line-static {
  position: absolute;
  bottom: -1px;
  height: 1.5px;
  background: var(--nb-und-red);
  pointer-events: none;
  transition: left 0.4s cubic-bezier(0.25, 1, 0.5, 1), width 0.4s;
}

.nb-und .nav-links a {
  display: flex;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--nb-und-ink-2);
  text-decoration: none;
  padding: 0 1.1rem;
  height: var(--nb-und-nav-h);
  transition: color 0.22s;
  position: relative;
  white-space: nowrap;
}

.nb-und .nav-links a:hover {
  color: var(--nb-und-ink);
}

.nb-und .nav-links a.active {
  color: var(--nb-und-ink);
}

.nb-und .nav-links a span {
  display: inline-block;
  transition: letter-spacing 0.35s cubic-bezier(0.25, 1, 0.5, 1);
}

.nb-und .nav-links a:hover span {
  letter-spacing: 0.09em;
}

.nb-und .nav-links a.active span {
  letter-spacing: 0.02em;
}
/* Variant 2 — center-bloom (pure CSS) */

.nb-und .nav-links-v2 {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}

.nb-und .nav-links-v2 a {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--nb-und-ink-2);
  text-decoration: none;
  padding: 0 1.1rem;
  height: var(--nb-und-nav-h);
  position: relative;
  white-space: nowrap;
  transition: color 0.22s;
}

.nb-und .nav-links-v2 a:hover {
  color: var(--nb-und-ink);
}

.nb-und .nav-links-v2 a.active {
  color: var(--nb-und-ink);
}

.nb-und .nav-links-v2 a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  right: 50%;
  height: 1.5px;
  background: var(--nb-und-ink);
  transition: left 0.35s cubic-bezier(0.25, 1, 0.5, 1), right 0.35s cubic-bezier(0.25, 1, 0.5, 1);
}

.nb-und .nav-links-v2 a.active::after {
  background: var(--nb-und-red);
  left: 1.1rem;
  right: 1.1rem;
}

.nb-und .nav-links-v2 a:hover::after {
  left: 1.1rem;
  right: 1.1rem;
}
/* Variant 3 — left-wipe */

.nb-und .nav-links-v3 {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}

.nb-und .nav-links-v3 a {
  display: flex;
  align-items: center;
  height: var(--nb-und-nav-h);
  padding: 0 1.1rem;
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--nb-und-ink-2);
  transition: color 0.22s;
}

.nb-und .nav-links-v3 a:hover,
.nb-und .nav-links-v3 a.active {
  color: var(--nb-und-ink);
}

.nb-und .nav-links-v3 a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  right: 50%;
  height: 1.5px;
  background: var(--nb-und-ink);
  transition: left 0.3s ease, right 0.3s ease;
}

.nb-und .nav-links-v3 a:hover::before {
  left: 1.1rem;
  right: 1.1rem;
}

.nb-und .nav-links-v3 a.active::before {
  left: 1.1rem;
  right: 1.1rem;
  background: var(--nb-und-red);
}

.nb-und .nav-spacer {
  flex: 1;
}

.nb-und .nav-end {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-shrink: 0;
}

.nb-und .nav-end a {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--nb-und-ink-2);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}

.nb-und .nav-end a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  right: 50%;
  height: 1px;
  background: var(--nb-und-ink);
  transition: left 0.3s ease, right 0.3s ease;
}

.nb-und .nav-end a:hover {
  color: var(--nb-und-ink);
}

.nb-und .nav-end a:hover::after {
  left: 0;
  right: 0;
}

.nb-und .nav-end-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--nb-und-rule);
}

.nb-und .btn-nav {
  font-family: 'Instrument Sans', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--nb-und-paper);
  background: var(--nb-und-ink);
  border: none;
  padding: 8px 18px;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.2s;
}

.nb-und .btn-nav:hover {
  background: var(--nb-und-red);
}

.nb-und .page {
  padding-top: var(--nb-und-nav-h);
}

.nb-und .hero {
  padding: 6rem 3rem 4rem;
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: end;
}

.nb-und .hero-left h1 {
  font-family: 'Libre Baskerville', serif;
  font-size: clamp(3rem, 5vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--nb-und-ink);
  margin-bottom: 1.5rem;
}

.nb-und .hero-left h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--nb-und-red);
}

.nb-und .hero-left p {
  font-size: 1rem;
  color: var(--nb-und-ink-2);
  line-height: 1.7;
  max-width: 44ch;
}

.nb-und .hero-right {
  padding-bottom: 1rem;
}

.nb-und .hero-right p {
  font-family: 'Libre Baskerville', serif;
  font-size: 1.3rem;
  font-style: italic;
  font-weight: 400;
  color: var(--nb-und-ink-2);
  line-height: 1.6;
  max-width: 36ch;
}

.nb-und .hero-right p strong {
  color: var(--nb-und-ink);
  font-style: normal;
  font-weight: 700;
}

.nb-und .section-rule {
  height: 1px;
  background: var(--nb-und-rule);
  margin: 0 3rem;
}

.nb-und .section {
  padding: 5rem 3rem;
  max-width: 1440px;
  margin: 0 auto;
}

.nb-und .variant-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.nb-und .variant-num {
  font-family: 'Libre Baskerville', serif;
  font-size: 3rem;
  font-weight: 400;
  color: var(--nb-und-rule);
  line-height: 1;
}

.nb-und .variant-info h3 {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--nb-und-ink);
  letter-spacing: 0.02em;
  margin-bottom: 3px;
}

.nb-und .variant-info p {
  font-size: 0.78rem;
  color: var(--nb-und-ink-2);
  line-height: 1.5;
}

.nb-und .demo-nav {
  border: 1px solid var(--nb-und-rule);
  border-radius: 4px;
  background: var(--nb-und-paper);
  height: 60px;
  display: flex;
  align-items: center;
  padding: 0 2rem;
  position: relative;
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.nb-und .demo-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.nb-und .code-note {
  font-family: 'Instrument Sans', monospace;
  font-size: 0.72rem;
  color: var(--nb-und-ink-3);
  line-height: 1.7;
  background: #f2f0ea;
  border-left: 2px solid var(--nb-und-rule);
  padding: 0.75rem 1rem;
  border-radius: 0 3px 3px 0;
  margin-bottom: 3rem;
}

.nb-und .code-note code {
  font-family: monospace;
  color: var(--nb-und-red);
  font-size: 0.7rem;
}

.nb-und .alphabet-demo {
  margin: 4rem 3rem;
  padding: 3rem;
  border: 1px solid var(--nb-und-rule);
  border-radius: 4px;
  text-align: center;
}

.nb-und .alpha-label {
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--nb-und-ink-3);
  margin-bottom: 2rem;
}

.nb-und .alpha-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.nb-und .alpha-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-family: 'Libre Baskerville', serif;
  font-size: 1rem;
  color: var(--nb-und-ink-3);
  text-decoration: none;
  position: relative;
  transition: color 0.2s;
  border-radius: 4px;
}

.nb-und .alpha-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  right: 50%;
  height: 1px;
  background: var(--nb-und-ink);
  transition: left 0.3s ease, right 0.3s ease;
}

.nb-und .alpha-links a:hover {
  color: var(--nb-und-ink);
}

.nb-und .alpha-links a:hover::after {
  left: 8px;
  right: 8px;
}

.nb-und .showcase {
  padding: 5rem 3rem;
  border-top: 1px solid var(--nb-und-rule);
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.nb-und .showcase-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem 0;
  border-bottom: 1px solid var(--nb-und-rule);
  cursor: pointer;
  overflow: hidden;
  position: relative;
}

.nb-und .showcase-title {
  font-family: 'Libre Baskerville', serif;
  font-size: clamp(2rem, 4vw, 4rem);
  font-weight: 400;
  color: var(--nb-und-ink);
  line-height: 1;
  position: relative;
  display: inline-block;
  transition: color 0.2s;
}

.nb-und .showcase-title::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 100%;
  height: 2px;
  background: var(--nb-und-red);
  transition: right 0.5s cubic-bezier(0.25, 1, 0.5, 1);
}

.nb-und .showcase-item:hover .showcase-title::after {
  right: 0;
}

.nb-und .showcase-item:hover .showcase-title {
  color: var(--nb-und-red);
}

.nb-und .showcase-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nb-und .showcase-meta {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--nb-und-ink-3);
}

.nb-und .showcase-arrow {
  font-size: 1.5rem;
  color: var(--nb-und-ink-3);
  transform: translateX(-8px);
  transition: transform 0.3s ease, color 0.2s;
}

.nb-und .showcase-item:hover .showcase-arrow {
  transform: translateX(0);
  color: var(--nb-und-red);
}

@media (max-width: 900px) {
  .nb-und .hero {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3rem 1.5rem 2rem;
  }

  .nb-und .nav-end a,
    .nb-und .nav-end-dot {
    display: none;
  }

  .nb-und .section {
    padding: 3rem 1.5rem;
  }

  .nb-und .alphabet-demo {
    margin: 2rem 1.5rem;
    padding: 2rem 1rem;
  }

  .nb-und .showcase {
    padding: 3rem 1.5rem;
  }

  .nb-und .demo-nav {
    padding: 0 1rem;
  }

  .nb-und nav .nav-inner {
    padding: 0 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nb-und * {
    transition: none !important;
  }
}
```

## JavaScript
```js
(() => {
  // Scoped magnetic-line wiring. Two instances of the magnetic line
  // pattern run on the page (the main top nav + the demo nav in
  // variant 01). Each is independently bound to its wrapper + nav
  // + line + static-line via data-* attributes — no document.getElementById,
  // no shared state, multiple instances coexist safely.
  const root = document.querySelector('.nb-und');
  if (!root) return;

  function setupMagneticLine(navEl, wrapper, line, staticLine) {
    if (!navEl || !wrapper || !line || !staticLine) return;
    const links = navEl.querySelectorAll('a');

    function positionLine(el, targetLine, useAccent) {
      const wRect = wrapper.getBoundingClientRect();
      const rect = el.getBoundingClientRect();
      targetLine.style.left = (rect.left - wRect.left) + 'px';
      targetLine.style.width = rect.width + 'px';
      if (useAccent) targetLine.style.background = 'var(--nb-und-red)';
    }

    const active = navEl.querySelector('a.active');
    if (active) {
      requestAnimationFrame(() => positionLine(active, staticLine, true));
    }

    links.forEach((a) => {
      a.addEventListener('mouseenter', () => {
        positionLine(a, line);
        line.classList.add('visible');
      });
      a.addEventListener('click', (e) => {
        e.preventDefault();
        links.forEach((l) => l.classList.remove('active'));
        a.classList.add('active');
        positionLine(a, staticLine, true);
      });
    });
    wrapper.addEventListener('mouseleave', () => {
      line.classList.remove('visible');
    });
  }

  // Main top nav
  setupMagneticLine(
    root.querySelector('[data-nb-und-nav]'),
    root.querySelector('[data-nb-und-wrap]'),
    root.querySelector('[data-nb-und-line]'),
    root.querySelector('[data-nb-und-static]'),
  );

  // Demo 1 (the in-page variant showcase)
  setupMagneticLine(
    root.querySelector('[data-nb-und-demo-nav]'),
    root.querySelector('[data-nb-und-demo-wrap]'),
    root.querySelector('[data-nb-und-demo-line]'),
    root.querySelector('[data-nb-und-demo-static]'),
  );

  // Variant 2 / 3 click-to-activate (pure CSS hover; this just keeps the
  // active state in sync after a click).
  root.querySelectorAll('.nav-links-v2 a, .nav-links-v3 a').forEach((a) => {
    a.addEventListener('click', (e) => {
      e.preventDefault();
      const siblings = a.closest('ul').querySelectorAll('a');
      siblings.forEach((s) => s.classList.remove('active'));
      a.classList.add('active');
    });
  });

  // Alphabet ticker — 26 links built once.
  const alpha = root.querySelector('[data-nb-und-alpha]');
  if (alpha && alpha.childElementCount === 0) {
    'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('').forEach((ch) => {
      const a = document.createElement('a');
      a.href = '#';
      a.textContent = ch;
      a.addEventListener('click', (e) => e.preventDefault());
      alpha.appendChild(a);
    });
  }
})();
```

Techniques used in this demo

grid-templateMDN ↗clamp()MDN ↗

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